Bulletin

wall bulletin
Lower Yangtze regionChina

Authors: 超级管理员 | Edit: zhuliang

By October, the late rice matured in the center of Lower Yangtze region including Hubei, Hunan, Jiangxi and Fujian provinces, while semi-late rice and maize had been harvested in Jiangsu, Anhui and Zhejiang provinces. 

The comparison of the current crop NDVI development curve with the 5YA indicates that the crop conditions were slightly below average. According to CropWatch agro-climatic indicators, the accumulated precipitation was 6% higher, while the photosynthetically active radiation and temperature were 10% and 0.6℃ lower as compared to the fifteen-year averages, respectively. Reduced solar radiation throughout this monitoring period resulted in a decrease in potential biomass (BIOMASS, -10%). 

According to the BIOMASS map, the potential biomass production in most areas was lower than the 15YA. As shown in spatial NDVI patterns, 37.9% of the area, mostly distributed in the north of this region including Jiangsu, Anhui and Hubei provinces, presented average crop conditions compared to the five-year average. The crops in the remaining areas suffered from unfavorable conditions, which coincides with the situation depicted by the VCIx patterns. The average VCIx of this region is 0.94, and most area had VCIx values ranging from 0.8 to 1.

Overall, the continuously rainy and cloudy weather was detrimental to crop growth during this monitoring period, and the yield crops in the Lower Yangtze region is anticipated to be below average level. The Cropped arable fraction (CALF) in the region remained at 5YA while cropping intensity was 3% higher than 5YA, which could be attributed to the increased early rice planted area as mentioned in the previous bulletins. Rice production in the region was expected to be slightly above average.

Figure 4.x. Crop condition Lower Yangtze region, July-October 2020

    

(a) Crop condition development graph based on NDVI  (b) Time series PAR profile

(c)Spatial NDVI patterns compared to 5YA                      (d) NDVI profile


    

           (e) Maximum VCI                                                   (f) Biomass